17  * Fork and exec tiny 1 page executable which precisely controls its VM.
58 	if (unshare(CLONE_NEWNS) == -1) {  in make_private_tmp()
62 		exit(1);  in make_private_tmp()
64 	if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) == -1) {  in make_private_tmp()
65 		exit(1);  in make_private_tmp()
67 	if (mount(NULL, "/tmp", "tmpfs", 0, NULL) == -1) {  in make_private_tmp()
68 		exit(1);  in make_private_tmp()
72 static pid_t pid = -1;
110 #define VADDR (1UL << 32)
131 	mov_rsi((1ULL << 47) - 4096 - VADDR - 4096),
136 	/* write(0, &c, 1); */
139 	0xba, 0x01, 0x00, 0x00, 0x00,			/* mov edx, 1 */
140 	mov_eax(1),
143 	/* 1: pause(); */
147 	0xeb, 0xf7,	/* jmp 1b */
165 	h.e_ident[1] = 'E';  in make_exe()
169 	h.e_ident[5] = 1;  in make_exe()
170 	h.e_ident[6] = 1;  in make_exe()
174 	h.e_version = 1;  in make_exe()
181 	h.e_phnum = 1;  in make_exe()
187 	ph.p_type = 1;  in make_exe()
188 	ph.p_flags = (1<<2)|1;  in make_exe()
197 	if (fd == -1) {  in make_exe()
198 		exit(1);  in make_exe()
202 		exit(1);  in make_exe()
216  * 1: vsyscall VMA is --xp		vsyscall=xonly
245 		exit(1);  in vsyscall()
267 		g_vsyscall = 1;  in vsyscall()
278 		exit(1);  in vsyscall()
292 	case 1:  in main()
306 	/* Reserve fd 0 for 1-byte pipe ping from child. */  in main()
309 		return 1;  in main()
314 	if (pipe(pipefd) == -1) {  in main()
315 		return 1;  in main()
317 	if (dup2(pipefd[1], 0) != 0) {  in main()
318 		return 1;  in main()
322 	if (pid == -1) {  in main()
323 		return 1;  in main()
327 		return 1;  in main()
331 	if (read(pipefd[0], &_, 1) != 1) {  in main()
332 		return 1;  in main()
336 	if (fstat(exec_fd, &st) == -1) {  in main()
337 		return 1;  in main()
361 		if (fd == -1) {  in main()
362 			return 1;  in main()
380 		if (fd == -1) {  in main()
381 			return 1;  in main()
389 #define RSS1 "Rss:                   4 kB\n"  in main()
390 #define RSS2 "Rss:                   0 kB\n"  in main()
391 #define PSS1 "Pss:                   4 kB\n"  in main()
392 #define PSS2 "Pss:                   0 kB\n"  in main()
399 			"Size:                  4 kB\n",  in main()
400 			"KernelPageSize:        4 kB\n",  in main()
401 			"MMUPageSize:           4 kB\n",  in main()
402 			"Anonymous:             0 kB\n",  in main()
403 			"AnonHugePages:         0 kB\n",  in main()
404 			"Shared_Hugetlb:        0 kB\n",  in main()
405 			"Private_Hugetlb:       0 kB\n",  in main()
406 			"Locked:                0 kB\n",  in main()
436 		if (fd == -1) {  in main()
437 			return 1;  in main()
451 			"Anonymous:             0 kB\n",  in main()
452 			"AnonHugePages:         0 kB\n",  in main()
453 			"Shared_Hugetlb:        0 kB\n",  in main()
454 			"Private_Hugetlb:       0 kB\n",  in main()
455 			"Locked:                0 kB\n",  in main()
472 		if (fd == -1) {  in main()
473 			return 1;  in main()
478 		assert(buf[0] == '1');	/* ->total_vm */  in main()
479 		assert(buf[1] == ' ');  in main()
480 		assert(buf[2] == '0' || buf[2] == '1');	/* rss */  in main()
482 		assert(buf[4] == '0' || buf[2] == '1');	/* file rss */  in main()
484 		assert(buf[6] == '1');	/* ELF executable segments */  in main()